How are Multi-Function Switch issues diagnosed?
If the symptoms discussed, or similar symptoms occur, the multifunction switch will likely be suspected right away. This can be tested and diagnosed in all vehicles by testing the outputs of the switch when different settings are selected. For instance, if the headlights are turned on, and the windshield wipers come on as well, the switch can be tested to identify of the switch is sending the signal for the windshield washers, or if the control module is at fault. In most instances, the multi-function switch can be tested by removing the steering column trim, and testing outputs for continuity at the electrical connector.
How are Multi-Function Switches replaced?
For some vehicles, replacing the multifunction switch may involve simply removing the steering column cover or trim, disconnecting the electrical connector, and releasing the switch from the steering column by removing fasteners and mounting brackets. Other models will require all of this, but also the air bag, steering wheel, and clock spring (AIR coil) will need to be removed as well. It is important to note that the battery will be disconnected prior to servicing these components.
RepairPal Recommendations for Multi-Function Switch issues
For vehicles with frequent failures, the manufacturer should be consulted concerning possible warranty extensions or recalls. Also, the manufacturer may have updated, improved, or revised the multi-function switch, so purchasing the part through the dealer will ensure that the part is the most recent design, possibly eliminating the need to perform the repair in the near future.
What to look out for when dealing with Multi-Function Switch issues
When servicing the steering column, be aware that the airbag (SRS system) wiring harness runs along the steering column as well. Disturbing the air bag and harness without proper knowledge may cause SRS system faults, unintentional airbag deployment, or physical harm as a result.
Can I replace the Multifunction Switch myself?
If the multifunction switch being replaced does not require removing the airbag and steering wheel, this repair can be accomplished by most people. However, when airbag and steering wheel removal are necessary, it is not recommended unless proper precautions are taken and the repair is completely understood. In most cases, it is best to leave airbag removal to a professional technician.
